CN112782620A - Magnetic probe for optical pump atomic magnetometer - Google Patents
Magnetic probe for optical pump atomic magnetometer Download PDFInfo
- Publication number
- CN112782620A CN112782620A CN202011453073.8A CN202011453073A CN112782620A CN 112782620 A CN112782620 A CN 112782620A CN 202011453073 A CN202011453073 A CN 202011453073A CN 112782620 A CN112782620 A CN 112782620A
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- light beam
- light
- magnetic
- transmission system
- alkali metal
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- 230000003287 optical effect Effects 0.000 title claims abstract description 25
- 239000000523 sample Substances 0.000 title claims abstract description 24
- 230000005540 biological transmission Effects 0.000 claims abstract description 31
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 238000001228 spectrum Methods 0.000 claims description 27
- 150000001340 alkali metals Chemical class 0.000 claims description 24
- 229910052783 alkali metal Inorganic materials 0.000 claims description 20
- 239000000758 substrate Substances 0.000 claims description 16
- 238000001914 filtration Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 11
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 230000005284 excitation Effects 0.000 claims description 9
- 239000013307 optical fiber Substances 0.000 claims description 8
- 239000000696 magnetic material Substances 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 3
- 230000005415 magnetization Effects 0.000 abstract description 3
- 238000011161 development Methods 0.000 abstract description 2
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical group [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 9
- 238000004140 cleaning Methods 0.000 description 7
- 230000005358 geomagnetic field Effects 0.000 description 6
- 229910052792 caesium Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000010287 polarization Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000005281 excited state Effects 0.000 description 2
- 238000004020 luminiscence type Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 229910000737 Duralumin Inorganic materials 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
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- 238000012546 transfer Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
Abstract
The invention discloses a magnetic probe for an optical pump atomic magnetometer, which is convenient for system upgrading and technical iteration updating while ensuring the high performance of the magnetic probe by adopting a non-magnetization high-performance light beam transmission system, high-performance photoelectric conversion and modular design, and has the technical prospect of industrial development.
Description
Technical Field
The invention belongs to the technical field of atomic magnetometers, atomic gyroscopes, quantum precision measurement and the like, and particularly relates to a magnetic probe for an optical pump atomic magnetometer.
Background
The magnetic field is an important characteristic of a magnetic object, is one of the earliest physical phenomena recognized by human beings, and contains abundant and diverse magnetic field information from small molecules to atoms to large earth and interstellar space. Therefore, the measurement of magnetic fields has become an important technical means for understanding the physical world. In recent decades, high-precision measurement of magnetic fields has been widely used in the fields of earth science, military, biomedicine, basic physical science, and the like.
The high-performance magnetometer type for measuring the geomagnetic field in common use at present and internationally can be divided into a fluxgate magnetometer, a proton magnetometer, an atomic magnetometer, a superconducting magnetometer and an optical pump atomic magnetometer according to the working principle, wherein the optical pump atomic magnetometer is the magnetometer with the best practical performance of the magnetic field under the geomagnetic field intensity at present, and has the advantages of no zero drift, high sampling rate, continuous measurement, no need of strict orientation, no need of calibration and the like. When the geomagnetic field is measured, the geomagnetic field measuring device can measure the total field of the geomagnetic field and the gradient of the geomagnetic field; it can measure both slow changes in the magnetic field and fast transient magnetic fields. The most central and key component of the optical-pump atomic magnetometer is a magnetic probe, and how to realize the generation and transmission system of non-magnetized high-performance pump light in the magnetic probe is the most central key technology.
Disclosure of Invention
In view of this, the present invention provides a magnetic probe for an optical pump atomic magnetometer, which can meet the requirements of no magnetization and high performance of the optical pump atomic magnetometer.
The invention provides a magnetic probe for an optical pump atomic magnetometer, which comprises a mounting substrate, a spectrum lamp, a light beam transmission system and an atomic gas chamber assembly, wherein the spectrum lamp, the light beam transmission system and the atomic gas chamber assembly are sequentially mounted on the mounting substrate; the light beam transmission system is used for collimating, compressing and filtering the light beam generated by the spectrum lamp; and the atomic gas chamber component is used for converging and collimating the light beams output by the light beam transmission system after passing through an atomic gas chamber and then outputting the light beams.
Furthermore, the light beam transmission system comprises a Fresnel lens group, a light beam spot compression system, a light guide pipe and a light beam filtering transmission system which are sequentially arranged;
the Fresnel lens group is used for collimating the emergent light beam of the spectrum lamp; the light beam spot compression system compresses the collimated light beam by adopting an inverted telescope system; the light guide pipe is a light guide optical fiber; the light beam filtering and transmitting system comprises a light beam collimating system, an interference filter with the bandwidth of 2nm and a circular polarizer with the working wavelength of alkali metal D1 lines.
Furthermore, the atom gas chamber component comprises a non-magnetic heating system, a radio frequency exciting coil, an alkali metal atom gas chamber, a light beam converging lens group and a light guide pipe; the non-magnetic heating system is positioned on the outer side of the radio frequency excitation coil, the alkali metal atom air chamber is positioned in the middle of the radio frequency excitation coil, and light beams pass through the alkali metal atom air chamber and then are transmitted through the light beam converging lens group and the light guide pipe.
Furthermore, the mounting substrate is made of nonmagnetic materials.
Further, the mounting substrate further comprises a magnetic cleaning photoelectric conversion system for converting an optical signal carrying a magnetic resonance signal into an electrical signal.
Has the advantages that:
1. by adopting a non-magnetization high-performance light beam transmission system, high-performance photoelectric conversion and modular design, the invention ensures the high performance of the magnetic probe, facilitates the upgrading of the system and the iterative updating of the technology, and has the technical prospect of industrial development.
2. The invention purifies the electromagnetic environment of the magnetic probe by adopting the magnetic cleaning photoelectric conversion system, and the magnetic probe is designed by adopting the optical guide tube twice, so that the application range of the magnetic probe is expanded, and the influence of the residual magnetic field of the optical pump atomic magnetometer control circuit system, the control platform and other systems on the magnetic probe is avoided.
Drawings
FIG. 1 is a top view of a configuration of a magnetic probe for an optical pump atomic magnetometer according to the present invention.
FIG. 2 is a left side view of a configuration of a magnetic probe for an optical pump atomic magnetometer provided by the present invention.
FIG. 3 shows the size of a cesium atom gas cell for a magnetic probe of an optical pump atomic magnetometer, according to the present invention.
The device comprises a mounting substrate 1, a spectrum lamp 2, a light beam transmission system 3, a Fresnel lens group 4, a light beam spot compression system 5, a light guide pipe 6, a light beam filtering transmission system 7, a light beam collimation system 8, a light beam filtering transmission system 9, a vacuum chamber 10, an atomic air chamber component 11, a non-magnetic heating system 12, a radio frequency exciting coil 13, an alkali metal atomic air chamber 14, a light beam converging lens group 15, a light guide pipe 16 and a magnetic cleaning photoelectric conversion system 17.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The invention provides a magnetic probe for an optical pump atomic magnetometer, which comprises a mounting substrate 1, a spectrum lamp 2, a light beam transmission system 3 and an atomic gas chamber assembly 11, wherein the spectrum lamp 2, the light beam transmission system 3 and the atomic gas chamber assembly 11 are all mounted on the mounting substrate 1, as shown in figure 1.
The light beam transmission system 3 comprises a fresnel lens group 4, a light beam spot compression system 5, a light pipe 6 and a light beam filtering transmission system 7 which are arranged in sequence. The fresnel lens group 4 is used to collimate the emergent light beam of the spectrum lamp 2. And the light beam spot compression system 5 adopts an inverted telescope system to compress the collimated light beam spots. The light guide pipe 6 adopts light guide optical fibers to perform lossless long-distance transmission on light beams so as to eliminate the influence of electromagnetic signals of the spectrum lamp on magnetic detection signals. The light beam filtering and transmitting system 7 comprises a light beam collimating system 8, an interference filter 9 with the bandwidth of 2nm and a circular polarizing plate 10 with the working wavelength of alkali metal D1 line, and is used for enabling light beams to be incident into an atom gas chamber in parallel and enabling the polarization state of the light beams to be in the circular polarization state for preparing the atom polarization state.
The light-emitting principle of the spectrum lamp 2 is electrodeless discharge, and the light-emitting substances are alkali metal vapor and starting gas. Under the action of the high-frequency electric field, the glow-starting gas molecules in the bulb are ionized. The ionized glow-starting gas molecules transfer energy to alkali metal atoms through collision, and the alkali metal atoms are excited to an excited state. The alkali metal atom in the excited state emits light by transition back to the ground state. The spectrum of the spectrum lamp can be divided into two components, one is an effective component contributing to optical pumping and is called effective light; one is an inactive component that does not contribute to optical pumping. Luminescence of other spectral lines including alkali metal atoms and luminescence of the starting gas. Referred to as the null light. A good spectrum lamp should emit light with as strong an active component as possible and as weak an inactive component as possible.
The atom air chamber assembly 11 comprises a non-magnetic heating system 12, a radio frequency exciting coil 13, an alkali metal atom air chamber 14, a light beam converging lens group 15 and a light guide pipe 16, wherein the non-magnetic heating system 12 is positioned on the outer side of the radio frequency exciting coil 13, the alkali metal atom air chamber 14 is positioned in the middle of the radio frequency exciting coil 13, and light beams pass through the alkali metal atom air chamber 14 and then are transmitted through the light beam converging lens group 15 and the light guide pipe 16. The beam converging lens group 15 is configured to converge and collimate the transmitted beams passing through the atomic gas chamber, so that the beams enter the light guide pipe 16 as much as possible. The light guide tube 16 is a light guide fiber, and guides the light beam carrying the magnetic resonance signal out of the space range of the atomic gas chamber, and then converts the light signal into an electric signal.
The mounting substrate 1 is made of nonmagnetic material, and the mounting substrate 1 further comprises a magnetic cleaning photoelectric conversion system 17. The magnetic cleaning photoelectric conversion system 17 is a module for converting an optical signal carrying a magnetic resonance signal into an electrical signal, and adopts a photovoltaic mode, mainly adopts technologies such as lossless transmission of the electrical signal, bandwidth optimization, an alternating current amplification filter circuit module and the like, and improves the signal ratio of signal detection.
a. In the embodiment, the spectrum lamp 2 is a cesium spectrum lamp, the exciting circuit of the spectrum lamp is a capacitance three-point LC oscillating circuit, and the design key is to optimize the mutual matching relationship among the radio frequency signal, the coil and the spectrum lamp so as to realize the working mode and the stable output light intensity of the spectrum lamp, which will be elaborated in another patent of the project group.
b. In the embodiment, the light beam transmission system 3 is used for realizing the long-distance transmission of the cesium spectrum lamp and the characteristic of preparing the required light beam by the cesium atom polarization state, and the light beam transmission system 3 consists of a Fresnel lens group 4, a light beam spot compression system 5, a light guide pipe 6 and a light beam filtering transmission system 7. The cesium spectrum lamp has a light-emitting bulb in the form of a sphere with a diameter of about 5mm, and the light-emitting bulb is a divergent light source. The Fresnel lens group 4 in the system is used for light beam collimation, and the spot diameter of an emergent light beam is 20 mm; the light beam and light spot compression system 5 adopts an inverted telescope system consisting of thin lenses to compress light spots to 4 mm; the light guide pipe 6 adopts a light guide optical fiber with the inner diameter of 8mm and the outer diameter of 11mm, and realizes long-distance transmission of the emergent light beam of the spectrum lamp; the light beam filtering and transmitting system 7 comprises a light beam collimating system 8, an interference filter 9 with the bandwidth of 2nm and a circular polarizing film with the working wavelength of cesium atom D1 line, wherein the light beam collimating system 8 is a thin lens group, so that the convergence and collimation of divergent light beams emitted by the light guide optical fiber are realized; the interference filter 9 with the bandwidth of 2nm filters all light beams except a D1 line in the cesium spectrum lamp so as to improve the light pumping effect and reduce light field noise; the circularly polarizing plate is formed by gluing a linear polarizing plate and 1/4 wave plate optical cement together, and converts incident linearly polarized light into circularly polarized light with the working wavelength of 894 nm;
c. in the example, the radio frequency excitation coil 11 is composed of a non-magnetic heating system 12, a radio frequency excitation coil 13, an alkali metal atom air chamber 14, a light beam converging lens group 15 and a light guide pipe 16, wherein the non-magnetic heating system 12 heats the atom air chamber, two end faces of the air chamber are subjected to alternating current heating in a mode of winding four groups of wires in parallel, and the working frequency of the alternating current heating is 10 kHz; 5, injecting a radio frequency signal into the space where the atomic gas chamber is located by the radio frequency excitation coil 13, so that the alkali metal atoms, the magnetic field and the radio frequency signal generate a magnetic resonance signal; the alkali metal atom gas chamber 14 is a cesium atom gas chamber, the size of rubidium of which is shown in figure 3, the diameter of the alkali metal atom gas chamber is 25mm, the length of the alkali metal atom gas chamber is 50mm, and the alkali metal atom gas chamber is filled with cesium atoms; the light beam converging lens group 15 is used for converging and collimating the transmitted diverging light beams passing through the atomic gas chamber, so that the light beams enter the light guide pipe 16 as much as possible, and the light beams carry magnetic resonance signals; the light guide pipe 16 adopts a light guide optical fiber with the inner diameter of 8mm and the outer diameter of 11mm, and has the functions of guiding a light beam carrying a magnetic resonance signal out of the space range of the atomic gas chamber and then converting the optical signal into an electric signal, wherein the light guide optical fiber is designed to purify the electromagnetic environment near the magnetic probe;
d. in the example, the mounting substrate assembly 1 is composed of a mounting substrate 1, a magnetic cleaning photoelectric conversion system 17 and a light guide pipe 16, wherein the mounting substrate is used as a supporting framework of the spectrum lamp 2, the light beam transmission system 3 and the radio frequency excitation coil 11 and is made of duralumin; the light guide pipe 16 adopts a light guide optical fiber with the inner diameter of 8mm and the outer diameter of 11mm, and has the function of guiding a light beam carrying a magnetic resonance signal out of the space range of the atomic gas chamber, and then converting the optical signal into an electric signal; the magnetic cleaning photoelectric conversion system 17 is a module for converting an optical signal carrying a magnetic resonance signal into an electrical signal, and adopts the photovoltaic mode, mainly adopts the technologies of lossless transmission of the electrical signal, bandwidth optimization, an alternating current amplification filter circuit module and the like, so as to improve the signal ratio of signal detection.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A magnetic probe for an optical pump atomic magnetometer is characterized by comprising a mounting substrate (1), a spectrum lamp (2), a light beam transmission system (3) and an atomic gas chamber assembly (11), wherein the spectrum lamp (2), the light beam transmission system (3) and the atomic gas chamber assembly (11) are sequentially mounted on the mounting substrate (1); the light beam transmission system (3) is used for collimating, compressing and filtering the light beam generated by the spectrum lamp (2); and the atomic gas chamber assembly (11) is used for converging and collimating the light beams output by the light beam transmission system (3) after passing through an atomic gas chamber and then outputting the light beams.
2. The magnetic probe according to claim 1, characterized in that the beam transmission system (3) comprises a fresnel lens group (4), a beam spot compression system (5), a light pipe (6) and a beam filtering transmission system (7) arranged in sequence;
the Fresnel lens group (4) is used for collimating the emergent light beam of the spectrum lamp (2); the light beam spot compression system (5) compresses the collimated light beam by adopting an inverted telescope system; the light guide pipe (6) is a light guide optical fiber; the light beam filtering and transmitting system (7) comprises a light beam collimating system (8), an interference filter (9) with the bandwidth of 2nm and a circular polarizing plate (10) with the working wavelength of an alkali metal D1 line.
3. The magnetic probe according to claim 1, wherein the atom gas cell assembly (11) comprises a non-magnetic heating system (12), a radio frequency excitation coil (13), an alkali metal atom gas cell (14), a beam converging lens group (15) and a light pipe (16); the non-magnetic heating system (12) is located on the outer side of the radio frequency excitation coil (13), the alkali metal atom air chamber (14) is located in the middle of the radio frequency excitation coil (13), and light beams pass through the alkali metal atom air chamber (14) and then are transmitted through the light beam converging lens group (15) and the light guide pipe (16).
4. A magnetic probe as claimed in claim 1, characterized in that the mounting substrate (1) is made of a non-magnetic material.
5. A magnetic probe as claimed in claim 1, characterized in that the mounting substrate (1) further comprises a magnetic clean photo-electric conversion system (17), the magnetic clean photo-electric conversion system (17) being adapted to convert optical signals carrying magnetic resonance signals into electrical signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011453073.8A CN112782620A (en) | 2020-12-11 | 2020-12-11 | Magnetic probe for optical pump atomic magnetometer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011453073.8A CN112782620A (en) | 2020-12-11 | 2020-12-11 | Magnetic probe for optical pump atomic magnetometer |
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| Publication Number | Publication Date |
|---|---|
| CN112782620A true CN112782620A (en) | 2021-05-11 |
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| CN202011453073.8A Pending CN112782620A (en) | 2020-12-11 | 2020-12-11 | Magnetic probe for optical pump atomic magnetometer |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6472869B1 (en) * | 2001-06-18 | 2002-10-29 | United States Of America As Represented By The Secretary Of The Air Force | Diode laser-pumped magnetometer |
| US20130265042A1 (en) * | 2012-04-06 | 2013-10-10 | Hitachi, Ltd. | Optical Pumping Magnetometer |
| US20140320123A1 (en) * | 2013-04-25 | 2014-10-30 | Canon Kabushiki Kaisha | Optical pumping magnetometer and magnetic sensing method |
| FR3035719A1 (en) * | 2015-04-30 | 2016-11-04 | Commissariat Energie Atomique | OPTICALLY PUMPED MAGNETOMETER STRUCTURE |
| CN111142053A (en) * | 2019-12-26 | 2020-05-12 | 兰州空间技术物理研究所 | Digital measuring device based on rubidium spectrum light pump magnetometer |
-
2020
- 2020-12-11 CN CN202011453073.8A patent/CN112782620A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6472869B1 (en) * | 2001-06-18 | 2002-10-29 | United States Of America As Represented By The Secretary Of The Air Force | Diode laser-pumped magnetometer |
| US20130265042A1 (en) * | 2012-04-06 | 2013-10-10 | Hitachi, Ltd. | Optical Pumping Magnetometer |
| US20140320123A1 (en) * | 2013-04-25 | 2014-10-30 | Canon Kabushiki Kaisha | Optical pumping magnetometer and magnetic sensing method |
| FR3035719A1 (en) * | 2015-04-30 | 2016-11-04 | Commissariat Energie Atomique | OPTICALLY PUMPED MAGNETOMETER STRUCTURE |
| CN111142053A (en) * | 2019-12-26 | 2020-05-12 | 兰州空间技术物理研究所 | Digital measuring device based on rubidium spectrum light pump magnetometer |
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